Machine for sand-molding



(No Model.) 2 Sheets-Sheet 1.

M. J. BROSNAN 8v' G. SHARPB. MACHINE POR SAND MOLDING.

No. 531,901. Patented Jan.. 1,1895.

2 Sheets-Sheet 2.

(No Model.)

M. J. BROSNAN & G. SHARPE.

MACHINE FOR SAND MOLDING.

Patented Ja. 1,r 1895.

. u Mw,

rection draws the pattern down from the ,A2 supported on the framing A and by means UNITED STATES PATENT @Erice MICHAEL J. BROSNAN AND GEORGE SHARPE, OF COXSACKIE, FV YORK.

MACHINE .FOR SAND-MOLDING.

SPECIFICATION forming part `of Letters Patent No. 531,901, dated January 1, 1895.

Application nea naar 2,

To all whom 1S may concern:

' Beit known that we, MICHAEL J. BRosNAN and GEORGE SHARPE, citizens of the United States; residing at Coxsackie, Greene county, in the State of New York, have invented a certain new and useful Improvement in Machin es for Sand-Moldin g, of which the following is a specification.

Our improvements relate to that class of machines having provisions for drawing the pattern by a cam motion. Ve have devised a form of machine having a pattern plate counterbalanced. A simple operation by hand or by power, communicates a partial revolution which raises the pattern and after the sand is applied and compressed, a proper motion of the camshaft in the opposite distripping-plate. A positive stop arrests the revolution at the right point when the pattern is up. The arrangement holds the pattern-plate alternately at the respective ends of its motion first with the pattern up and then with it down without requiringany fastenings.

The machine is conveniently portable, is strong and simple, and eminently adapted for the general work of the foundry.

The accompanying drawings form a part of this specification and represent what we consider the best means of carrying out the invention.

Figure l isan end elevation partly in vertical section. Fig. 2 is a corresponding side elevation. Fig. 3 is a plan view partly in horizontal section with the stripping plate removed. Fig: 4 shows the machine with the pattern removed. It is a section on the line 4-4 in Fig. 1.

Similar letters of reference indicate co'rrespending parts in all the figures where they appear.

A is a rigid framing made of cast iron or other suitable material, and adapted to support firmly the several parts. It is provided with nicely finished vertical ways or guides A', which receive long straight parallel arms I3', rigidly bolted to and extending down from a rising and sinking table or `pattern plate B, on which We secure the pattern M.

A small pinion C is mounted on a fixed stud 1894. serrano. 502,029. (rumore.)

of a light fly-Wheel C and acrauk-handle C2, is turned at willin either direction.

D is a cam-shaft carrying eccentric cams D', D' of equal size, and similarly set on the shaft. A large gear-wheel D2 on one end of this shaft is engaged by the pinion C.

E is an ladj ustable and exchangeable strippingplate, and E E are T-headed screws engaged in corresponding recesses in the plate, and extending downward therefrom through proper holes in the framing A. They are stiiy set by means of nuts E2, E3, E4.

The under face of the pattern-plate B presents nicely finished surfaces adapted to receive the action of the eccentric cams D. By giving the crank C2 a few strong turns in one direction, the cam shaft is partially revolved and the pattern-plate B is raised to the required position, protruding the pattern M to the required extent through the carefully executed aperture in the stripping-plate and by means of the long straight guide arms B', held firmly against tilting.

The flask, not shown, is applied and the sand introduced, rammed and struck, by hand or by machinery, in any ordinary or suitable manner. Now the attendant turns the crank C2 a few revolutions in the opposite direction, with the effect to lower the pattern-plate and its attachments including the pattern M. The eccentric form of the cam and theyfact that the crank C2 is started from a state of rest, insure that the descending motion of the pattern shall be slowvat the commencement. The ellicient guides or vertical `Ways A steady the movement, so that there is no trembling or irregularity laterally, and the pattern is drawn smoothly out of the sand, the first part of the motion being slow and the later portion of the descending `movement rapid.

D is a projection cast orotherwise firmly fixed in the required position on one side of` each cam.

B are stops cast or otherwise firmly fixed in the required positions on the under face of the pattern-plate 13. Vthen the camshaft has been sufficiently rotatedto bring the cams into their highest position the projections D*3 strikethe siopsBz and insure that the motion is arrested at that point.

ID4 is a grooved pulley keyed or otherwise firmlyixed on the end of the shaft D, and car- IOO rying a chain G by which a. su''iciently heavyv mid-height, but itis more than sufficient to. lift the load when the cams are quite up.v

The arrangement offers little friction, and allows the attendant to turn the crank with ease alternately in opposite directions, as required, and insures th at the pattern-plate shall be held reliably without'other fastening at the two ends of its motion, respectively. When it is up it will be held up by reason of the fact that the eccentric cams are on their centers, and the gravity of the counterbalance weight is of full effect, and when it is down it will remain down by reason of the fact that the counterbalance weight is not sufficient to overcome the gravity of the plate and its attachments in addition to the friction when the-parts are in that position.

The work with our machine can proceed rapidly. It requires little skill. able. The smoothness of the motions, the economy of construction ot' the machine, its adaptation for working by hand, and its quality ot holding automatically 'at either end of the motion, will be appreciated.

Modifications. may be made by any good mechanic without-departing from the principle or sacrificing the advantages of the vinventio'n.-

The positions of the projections D3 or of thestops B2 against which they strike may be made adjustable. y

Parts of the invention can be used without the whole.

The projections and stops may be dispensed with, and the rotation of the cam shaft may It is portbe arrested at the approximately right place by providingr any suitable cushion under the weight H to arrest its descent when the eccentric cams are at orA very near their highl est points.

The pattern and the stripping plates may be changed indefinitely.

We claim as our invention- 1. The portable machine described comprising a frame Aand having gnidesA, a pattern plate B having vertical guiding arms B', traversing` such guides, an eccentric cam D' with means for turning it, a partial connterbalancing weight H, and a .flexible connection G operating on a pulley D'l turning the said cam in one direction witha constant force adapted to urge the pattern-plate alternately to each end of its motion, and-the projection D3 on the cam 1).', and the stop 1?2 on the patternplate for -arrest-ing the turning of the cam at the proper point for producing the mold, all combined and arranged for joint operation substantially as herein specified.

2i In a machine for sand molding,a frame having guides, a pattern-plate having arms traversing in such guides, an eccentric cam and means for turning it, the stripping plate E, screws E', and lock-nuts E?, E3, E, adapted to adjust the height and level of the stripping plate, and a connterbalancing weight H, and connection G andpulley D4, combined and arranged for joint operation substantially as herein specified.

In testimony that we claim the invention above setforth we aiix our signatures in presence of two witnesses.

MICHAEL J'JBRosNAN. GEO. sI-IARPE.

Witnesses:

A. C. DWIGHT, II. SALISBURY, Jr. 

